towards a SRC source + resampling during audition

1 files changed, 80 insertions, 0 deletions

diff --git a/libs/ardour/ardour/srcfilesource.h b/libs/ardour/ardour/srcfilesource.h
new file mode 100644
index 0000000000..0b0865acc6
--- /dev/null
+++ b/libs/ardour/ardour/srcfilesource.h
@@ -0,0 +1,80 @@
+/*
+    Copyright (C) 2014 Paul Davis
+    Written by: Robin Gareus <robin@gareus.org>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifndef __ardour_srcfilesource_h__
+#define __ardour_srcfilesource_h__
+
+#include <cstring>
+#include <samplerate.h>
+#include "ardour/audiofilesource.h"
+#include "ardour/session.h"
+
+namespace ARDOUR {
+
+class SrcFileSource : public AudioFileSource {
+public:
+	SrcFileSource (Session&, boost::shared_ptr<AudioFileSource>, SrcQuality srcq = SrcQuality(SrcQuick));
+	~SrcFileSource ();
+
+	int update_header (framepos_t /*when*/, struct tm&, time_t) { return 0; }
+	int flush_header () { return 0; }
+	void set_header_timeline_position () {};
+	void set_length (framecnt_t /*len*/) {};
+
+	float sample_rate () const { return _session.nominal_frame_rate(); }
+
+	framepos_t natural_position() const { return _source->natural_position() * _ratio;}
+	framecnt_t readable_length() const { return _source->readable_length() * _ratio; }
+	framecnt_t length (framepos_t pos) const { return _source->length(pos) * _ratio; }
+
+	bool destructive() const { return false; }
+	bool can_be_analysed() const { return false; }
+	bool clamped_at_unity() const { return false; }
+
+protected:
+	framecnt_t read_unlocked (Sample *dst, framepos_t start, framecnt_t cnt) const;
+	framecnt_t write_unlocked (Sample */*dst*/, framecnt_t /*cnt*/) { return 0; }
+
+	int read_peaks_with_fpp (PeakData *peaks, framecnt_t npeaks, framepos_t /*start*/, framecnt_t /*cnt*/,
+				 double /*samples_per_unit*/, framecnt_t /*fpp*/) const {
+		memset (peaks, 0, sizeof (PeakData) * npeaks);
+		return 0;
+	}
+
+private:
+	static const uint32_t blocksize;
+	boost::shared_ptr<AudioFileSource> _source;
+
+	mutable SRC_STATE* _src_state;
+	mutable SRC_DATA   _src_data;
+
+	mutable Sample* _src_buffer;
+	mutable framepos_t _source_position;
+	mutable framepos_t _target_position;
+	mutable double _fract_position;
+
+	double _ratio;
+	framecnt_t src_buffer_size;
+};
+
+} // namespace ARDOUR
+
+#endif /* __ardour_audiofilesource_h__ */
+